text: DK_BATCH_SIZE = "batch_size"
  DK_BATCH_TARGET_TSR = "batch_target_tensor"
  DK_BATCH_UNIQUE_STR_ID_SET = "batch_unique_id_set"
  DK_BATCH_NODE_LABEL_LIST = "batch_node_label_list"
  DK_BATCH_NODE_FEATURE_TSR = "batch_node_feature_tsr"
  DK_BATCH_NODE_SHAPE_TSR = "batch_node_shape_tsr"
  
  
  CHKPT_COMPLETED_EPOCHS = "completed_epochs"
  CHKPT_MODEL = "model"
  CHKPT_DISCRIMINATOR = "discriminator"
  CHKPT_OPTIMIZER = "optimizer"
  CHKPT_METADATA = "metadata"
  CHKPT_PARAMS = "params"
  CHKPT_BEST_EVAL_RESULT = "best_eval_result"
  CHKPT_BEST_EVAL_EPOCH = "best_eval_epoch"
  CHKPT_PAST_EVAL_RESULTS = "past_eval_results"
  CHKPT_ITERATION = "iteration"
  CHKPT_BEST_EVAL_ITERATION = "best_eval_iteration"
  